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<FONT color="green">001</FONT>    package org.hackystat.sensorbase.uricache;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import java.io.File;<a name="line.3"></a>
<FONT color="green">004</FONT>    import java.io.IOException;<a name="line.4"></a>
<FONT color="green">005</FONT>    import java.util.ArrayList;<a name="line.5"></a>
<FONT color="green">006</FONT>    import java.util.Collections;<a name="line.6"></a>
<FONT color="green">007</FONT>    import java.util.Comparator;<a name="line.7"></a>
<FONT color="green">008</FONT>    import java.util.List;<a name="line.8"></a>
<FONT color="green">009</FONT>    <a name="line.9"></a>
<FONT color="green">010</FONT>    import org.hackystat.utilities.uricache.UriCache;<a name="line.10"></a>
<FONT color="green">011</FONT>    import org.hackystat.utilities.uricache.UriCacheException;<a name="line.11"></a>
<FONT color="green">012</FONT>    import org.hackystat.utilities.uricache.UriCacheProperties;<a name="line.12"></a>
<FONT color="green">013</FONT>    <a name="line.13"></a>
<FONT color="green">014</FONT>    /**<a name="line.14"></a>
<FONT color="green">015</FONT>     * Provides an interface to UriCache for the SensorBase. Currently it provides non-persistent<a name="line.15"></a>
<FONT color="green">016</FONT>     * implementation. I.e. data will be wiped out once SensorBase is shutdown.<a name="line.16"></a>
<FONT color="green">017</FONT>     * <a name="line.17"></a>
<FONT color="green">018</FONT>     * @author Pavel Senin<a name="line.18"></a>
<FONT color="green">019</FONT>     * @since 10-07-2007.<a name="line.19"></a>
<FONT color="green">020</FONT>     */<a name="line.20"></a>
<FONT color="green">021</FONT>    public class UriCacheManager {<a name="line.21"></a>
<FONT color="green">022</FONT>    <a name="line.22"></a>
<FONT color="green">023</FONT>      private static final String fileSeparator = System.getProperty("file.separator");<a name="line.23"></a>
<FONT color="green">024</FONT>    <a name="line.24"></a>
<FONT color="green">025</FONT>      private static final String defaultCacheName = "UriCache";<a name="line.25"></a>
<FONT color="green">026</FONT>    <a name="line.26"></a>
<FONT color="green">027</FONT>      private static String defaultCacheHome = System.getProperty("user.home") + fileSeparator<a name="line.27"></a>
<FONT color="green">028</FONT>          + ".hackystat" + fileSeparator + "sensorbase" + fileSeparator + "cache";<a name="line.28"></a>
<FONT color="green">029</FONT>    <a name="line.29"></a>
<FONT color="green">030</FONT>      /**<a name="line.30"></a>
<FONT color="green">031</FONT>       * Creates new UriCacheManager instance.<a name="line.31"></a>
<FONT color="green">032</FONT>       * <a name="line.32"></a>
<FONT color="green">033</FONT>       */<a name="line.33"></a>
<FONT color="green">034</FONT>      public UriCacheManager() {<a name="line.34"></a>
<FONT color="green">035</FONT>        assert true;<a name="line.35"></a>
<FONT color="green">036</FONT>      }<a name="line.36"></a>
<FONT color="green">037</FONT>    <a name="line.37"></a>
<FONT color="green">038</FONT>      /**<a name="line.38"></a>
<FONT color="green">039</FONT>       * Creates the UriCache for the specified host and user.<a name="line.39"></a>
<FONT color="green">040</FONT>       * <a name="line.40"></a>
<FONT color="green">041</FONT>       * @param storagePath caches storage path to search within.<a name="line.41"></a>
<FONT color="green">042</FONT>       * @param sensorBaseHost the sensorbase host key.<a name="line.42"></a>
<FONT color="green">043</FONT>       * @param userEmail the user email key.<a name="line.43"></a>
<FONT color="green">044</FONT>       * @return new cache instance.<a name="line.44"></a>
<FONT color="green">045</FONT>       * @throws UriCacheException in the case of error.<a name="line.45"></a>
<FONT color="green">046</FONT>       * @throws IOException if unable create property file.<a name="line.46"></a>
<FONT color="green">047</FONT>       */<a name="line.47"></a>
<FONT color="green">048</FONT>      public static synchronized UriCache getCache(String storagePath,<a name="line.48"></a>
<FONT color="green">049</FONT>          String sensorBaseHost, String userEmail) throws UriCacheException, IOException {<a name="line.49"></a>
<FONT color="green">050</FONT>    <a name="line.50"></a>
<FONT color="green">051</FONT>        // let's figure out where to look for the cache(s)<a name="line.51"></a>
<FONT color="green">052</FONT>        String cacheHome = null;<a name="line.52"></a>
<FONT color="green">053</FONT>        if (null == storagePath) {<a name="line.53"></a>
<FONT color="green">054</FONT>          cacheHome = defaultCacheHome;<a name="line.54"></a>
<FONT color="green">055</FONT>        }<a name="line.55"></a>
<FONT color="green">056</FONT>        else {<a name="line.56"></a>
<FONT color="green">057</FONT>          cacheHome = storagePath;<a name="line.57"></a>
<FONT color="green">058</FONT>        }<a name="line.58"></a>
<FONT color="green">059</FONT>    <a name="line.59"></a>
<FONT color="green">060</FONT>        // now analyze if the path exists, if not we are going to create one<a name="line.60"></a>
<FONT color="green">061</FONT>        File folder = new File(cacheHome);<a name="line.61"></a>
<FONT color="green">062</FONT>        if (!folder.exists()) {<a name="line.62"></a>
<FONT color="green">063</FONT>          folder.mkdirs();<a name="line.63"></a>
<FONT color="green">064</FONT>        }<a name="line.64"></a>
<FONT color="green">065</FONT>    <a name="line.65"></a>
<FONT color="green">066</FONT>        // now we are going to locate cache<a name="line.66"></a>
<FONT color="green">067</FONT>        UriCache tryCache = locateCache(cacheHome, sensorBaseHost, userEmail);<a name="line.67"></a>
<FONT color="green">068</FONT>    <a name="line.68"></a>
<FONT color="green">069</FONT>        // but if cache is not found we will create one<a name="line.69"></a>
<FONT color="green">070</FONT>        if (null == tryCache) {<a name="line.70"></a>
<FONT color="green">071</FONT>          // create and save properties<a name="line.71"></a>
<FONT color="green">072</FONT>          UriCacheDescription cacheDesc = new UriCacheDescription(defaultCacheName, sensorBaseHost,<a name="line.72"></a>
<FONT color="green">073</FONT>              userEmail);<a name="line.73"></a>
<FONT color="green">074</FONT>          cacheDesc.save(cacheHome);<a name="line.74"></a>
<FONT color="green">075</FONT>          // create, save cache and return UriCache handler<a name="line.75"></a>
<FONT color="green">076</FONT>          UriCacheProperties cacheProp = new UriCacheProperties();<a name="line.76"></a>
<FONT color="green">077</FONT>          cacheProp.setCacheStoragePath(cacheHome);<a name="line.77"></a>
<FONT color="green">078</FONT>          UriCache newCache = new UriCache(cacheDesc.getName(),<a name="line.78"></a>
<FONT color="green">079</FONT>              cacheProp);<a name="line.79"></a>
<FONT color="green">080</FONT>          newCache.clear();<a name="line.80"></a>
<FONT color="green">081</FONT>          return newCache;<a name="line.81"></a>
<FONT color="green">082</FONT>        }<a name="line.82"></a>
<FONT color="green">083</FONT>        else {<a name="line.83"></a>
<FONT color="green">084</FONT>          return tryCache;<a name="line.84"></a>
<FONT color="green">085</FONT>        }<a name="line.85"></a>
<FONT color="green">086</FONT>      }<a name="line.86"></a>
<FONT color="green">087</FONT>    <a name="line.87"></a>
<FONT color="green">088</FONT>      /**<a name="line.88"></a>
<FONT color="green">089</FONT>       * Locates cache for host and user provided, if unable to find cache, reports null. Meanwhile<a name="line.89"></a>
<FONT color="green">090</FONT>       * doing search cleans up old caches which are basically leftovers.<a name="line.90"></a>
<FONT color="green">091</FONT>       * <a name="line.91"></a>
<FONT color="green">092</FONT>       * @param storagePath caches storage path to search within.<a name="line.92"></a>
<FONT color="green">093</FONT>       * @param sensorBaseHost the sensorbase host key.<a name="line.93"></a>
<FONT color="green">094</FONT>       * @param userEmail the user email key.<a name="line.94"></a>
<FONT color="green">095</FONT>       * @return UriCache instance associated with sensorbase and user email keys provided or null if<a name="line.95"></a>
<FONT color="green">096</FONT>       *         not found.<a name="line.96"></a>
<FONT color="green">097</FONT>       * @throws UriCacheException if unable to operate with cache.<a name="line.97"></a>
<FONT color="green">098</FONT>       */<a name="line.98"></a>
<FONT color="green">099</FONT>      private static synchronized UriCache locateCache(String storagePath,<a name="line.99"></a>
<FONT color="green">100</FONT>          String sensorBaseHost, String userEmail) throws UriCacheException {<a name="line.100"></a>
<FONT color="green">101</FONT>    <a name="line.101"></a>
<FONT color="green">102</FONT>        // getting cache home folder<a name="line.102"></a>
<FONT color="green">103</FONT>        String cacheHome = null;<a name="line.103"></a>
<FONT color="green">104</FONT>        if (null == storagePath) {<a name="line.104"></a>
<FONT color="green">105</FONT>          cacheHome = defaultCacheHome;<a name="line.105"></a>
<FONT color="green">106</FONT>        }<a name="line.106"></a>
<FONT color="green">107</FONT>        else {<a name="line.107"></a>
<FONT color="green">108</FONT>          cacheHome = storagePath;<a name="line.108"></a>
<FONT color="green">109</FONT>        }<a name="line.109"></a>
<FONT color="green">110</FONT>    <a name="line.110"></a>
<FONT color="green">111</FONT>        // getting list of caches associated with the host and user email provided<a name="line.111"></a>
<FONT color="green">112</FONT>        List&lt;UriCacheDescription&gt; cachesList = getCaches(cacheHome);<a name="line.112"></a>
<FONT color="green">113</FONT>        List&lt;UriCacheDescription&gt; candidatesList = new ArrayList&lt;UriCacheDescription&gt;();<a name="line.113"></a>
<FONT color="green">114</FONT>        if (null != cachesList) {<a name="line.114"></a>
<FONT color="green">115</FONT>          for (UriCacheDescription cd : cachesList) {<a name="line.115"></a>
<FONT color="green">116</FONT>            if ((userEmail.equalsIgnoreCase(cd.getUserEmail()))<a name="line.116"></a>
<FONT color="green">117</FONT>                &amp;&amp; (sensorBaseHost.equalsIgnoreCase(cd.getsensorBaseHost()))) {<a name="line.117"></a>
<FONT color="green">118</FONT>              candidatesList.add(cd);<a name="line.118"></a>
<FONT color="green">119</FONT>            }<a name="line.119"></a>
<FONT color="green">120</FONT>          }<a name="line.120"></a>
<FONT color="green">121</FONT>        }<a name="line.121"></a>
<FONT color="green">122</FONT>    <a name="line.122"></a>
<FONT color="green">123</FONT>        // if found nothing report it<a name="line.123"></a>
<FONT color="green">124</FONT>        if (candidatesList.isEmpty()) {<a name="line.124"></a>
<FONT color="green">125</FONT>          return null;<a name="line.125"></a>
<FONT color="green">126</FONT>        }<a name="line.126"></a>
<FONT color="green">127</FONT>    <a name="line.127"></a>
<FONT color="green">128</FONT>        // ok, now let's pick the cache which is latest and not active<a name="line.128"></a>
<FONT color="green">129</FONT>        Collections.sort(candidatesList, cacheDescriptionTimeComparator());<a name="line.129"></a>
<FONT color="green">130</FONT>        Integer length = candidatesList.size();<a name="line.130"></a>
<FONT color="green">131</FONT>    <a name="line.131"></a>
<FONT color="green">132</FONT>        Integer position = null;<a name="line.132"></a>
<FONT color="green">133</FONT>        UriCache cache = null;<a name="line.133"></a>
<FONT color="green">134</FONT>    <a name="line.134"></a>
<FONT color="green">135</FONT>        // We are going to iterate over caches from the latest file up to oldest one. The latest cache<a name="line.135"></a>
<FONT color="green">136</FONT>        // which is not active will be returned from this method, all other inactive caches will be<a name="line.136"></a>
<FONT color="green">137</FONT>        // deleted.<a name="line.137"></a>
<FONT color="green">138</FONT>        for (int i = length - 1; i &gt;= 0; i--) {<a name="line.138"></a>
<FONT color="green">139</FONT>          UriCacheDescription desc = candidatesList.get(i);<a name="line.139"></a>
<FONT color="green">140</FONT>          // check if this instance is available<a name="line.140"></a>
<FONT color="green">141</FONT>          try {<a name="line.141"></a>
<FONT color="green">142</FONT>            UriCacheProperties cacheProperties = new UriCacheProperties();<a name="line.142"></a>
<FONT color="green">143</FONT>            cacheProperties.setCacheStoragePath(cacheHome);<a name="line.143"></a>
<FONT color="green">144</FONT>            cache = new UriCache(desc.getName(), cacheProperties);<a name="line.144"></a>
<FONT color="green">145</FONT>            // if we got this cache - break the loop and clean the rest of caches<a name="line.145"></a>
<FONT color="green">146</FONT>            position = i;<a name="line.146"></a>
<FONT color="green">147</FONT>            break;<a name="line.147"></a>
<FONT color="green">148</FONT>          }<a name="line.148"></a>
<FONT color="green">149</FONT>          catch (UriCacheException e) {<a name="line.149"></a>
<FONT color="green">150</FONT>            String errorMessage = e.getMessage();<a name="line.150"></a>
<FONT color="green">151</FONT>            if (errorMessage.contains("is in use")) {<a name="line.151"></a>
<FONT color="green">152</FONT>              assert true;<a name="line.152"></a>
<FONT color="green">153</FONT>            }<a name="line.153"></a>
<FONT color="green">154</FONT>            else {<a name="line.154"></a>
<FONT color="green">155</FONT>              throw new UriCacheException(e);<a name="line.155"></a>
<FONT color="green">156</FONT>            }<a name="line.156"></a>
<FONT color="green">157</FONT>          }<a name="line.157"></a>
<FONT color="green">158</FONT>        }<a name="line.158"></a>
<FONT color="green">159</FONT>    <a name="line.159"></a>
<FONT color="green">160</FONT>        // here we suppose to have two variable to check the cache and position<a name="line.160"></a>
<FONT color="green">161</FONT>        // basically we are going to return this cache instance, it's null if we didn't get cache<a name="line.161"></a>
<FONT color="green">162</FONT>        // if we got a cache than we do a little clean-up and return cache anyway<a name="line.162"></a>
<FONT color="green">163</FONT>        if ((null != position) &amp;&amp; (position &gt; 0)) {<a name="line.163"></a>
<FONT color="green">164</FONT>          for (int i = position - 1; i &gt;= 0; i--) {<a name="line.164"></a>
<FONT color="green">165</FONT>            UriCacheDescription desc = candidatesList.get(i);<a name="line.165"></a>
<FONT color="green">166</FONT>            try {<a name="line.166"></a>
<FONT color="green">167</FONT>              UriCacheProperties cacheProperties = new UriCacheProperties();<a name="line.167"></a>
<FONT color="green">168</FONT>              cacheProperties.setCacheStoragePath(cacheHome);<a name="line.168"></a>
<FONT color="green">169</FONT>              UriCache tryCache = new UriCache(desc.getName(),<a name="line.169"></a>
<FONT color="green">170</FONT>                  cacheProperties);<a name="line.170"></a>
<FONT color="green">171</FONT>              // if we were able to get this instance - this is leftover - wipe it<a name="line.171"></a>
<FONT color="green">172</FONT>              tryCache.shutdown();<a name="line.172"></a>
<FONT color="green">173</FONT>              String fileName = cacheHome + fileSeparator + desc.getName();<a name="line.173"></a>
<FONT color="green">174</FONT>              File file2Delete = new File(fileName + ".data");<a name="line.174"></a>
<FONT color="green">175</FONT>              file2Delete.delete();<a name="line.175"></a>
<FONT color="green">176</FONT>              file2Delete = new File(fileName + ".key");<a name="line.176"></a>
<FONT color="green">177</FONT>              file2Delete.delete();<a name="line.177"></a>
<FONT color="green">178</FONT>              file2Delete = new File(fileName + ".desc");<a name="line.178"></a>
<FONT color="green">179</FONT>              file2Delete.delete();<a name="line.179"></a>
<FONT color="green">180</FONT>            }<a name="line.180"></a>
<FONT color="green">181</FONT>            catch (UriCacheException e) {<a name="line.181"></a>
<FONT color="green">182</FONT>              String errorMessage = e.getMessage();<a name="line.182"></a>
<FONT color="green">183</FONT>              if (errorMessage.contains("is in use")) {<a name="line.183"></a>
<FONT color="green">184</FONT>                assert true;<a name="line.184"></a>
<FONT color="green">185</FONT>              }<a name="line.185"></a>
<FONT color="green">186</FONT>              else {<a name="line.186"></a>
<FONT color="green">187</FONT>                throw new UriCacheException(e);<a name="line.187"></a>
<FONT color="green">188</FONT>              }<a name="line.188"></a>
<FONT color="green">189</FONT>            }<a name="line.189"></a>
<FONT color="green">190</FONT>          }<a name="line.190"></a>
<FONT color="green">191</FONT>        }<a name="line.191"></a>
<FONT color="green">192</FONT>    <a name="line.192"></a>
<FONT color="green">193</FONT>        return cache;<a name="line.193"></a>
<FONT color="green">194</FONT>      }<a name="line.194"></a>
<FONT color="green">195</FONT>    <a name="line.195"></a>
<FONT color="green">196</FONT>      /**<a name="line.196"></a>
<FONT color="green">197</FONT>       * Reports a comparator instance for sorting descriptions.<a name="line.197"></a>
<FONT color="green">198</FONT>       * <a name="line.198"></a>
<FONT color="green">199</FONT>       * @return a comparator instance for sorting descriptions.<a name="line.199"></a>
<FONT color="green">200</FONT>       */<a name="line.200"></a>
<FONT color="green">201</FONT>      private static Comparator&lt;UriCacheDescription&gt; cacheDescriptionTimeComparator() {<a name="line.201"></a>
<FONT color="green">202</FONT>        return new UriCacheDescriptionTimeComparator();<a name="line.202"></a>
<FONT color="green">203</FONT>      }<a name="line.203"></a>
<FONT color="green">204</FONT>    <a name="line.204"></a>
<FONT color="green">205</FONT>      /**<a name="line.205"></a>
<FONT color="green">206</FONT>       * Reports list of caches found in the cache home folder.<a name="line.206"></a>
<FONT color="green">207</FONT>       * <a name="line.207"></a>
<FONT color="green">208</FONT>       * @param storagePath the cache home folder.<a name="line.208"></a>
<FONT color="green">209</FONT>       * @return the set of caches found or null if didn't find anything.<a name="line.209"></a>
<FONT color="green">210</FONT>       * @throws UriCacheException if unable to find cache home folder.<a name="line.210"></a>
<FONT color="green">211</FONT>       */<a name="line.211"></a>
<FONT color="green">212</FONT>      public static synchronized List&lt;UriCacheDescription&gt; getCaches(String storagePath)<a name="line.212"></a>
<FONT color="green">213</FONT>          throws UriCacheException {<a name="line.213"></a>
<FONT color="green">214</FONT>    <a name="line.214"></a>
<FONT color="green">215</FONT>        String cacheHome = null;<a name="line.215"></a>
<FONT color="green">216</FONT>        if (null == storagePath) {<a name="line.216"></a>
<FONT color="green">217</FONT>          cacheHome = defaultCacheHome;<a name="line.217"></a>
<FONT color="green">218</FONT>        }<a name="line.218"></a>
<FONT color="green">219</FONT>        else {<a name="line.219"></a>
<FONT color="green">220</FONT>          cacheHome = storagePath;<a name="line.220"></a>
<FONT color="green">221</FONT>        }<a name="line.221"></a>
<FONT color="green">222</FONT>    <a name="line.222"></a>
<FONT color="green">223</FONT>        List&lt;UriCacheDescription&gt; response = new ArrayList&lt;UriCacheDescription&gt;();<a name="line.223"></a>
<FONT color="green">224</FONT>        try {<a name="line.224"></a>
<FONT color="green">225</FONT>          File dir = new File(cacheHome);<a name="line.225"></a>
<FONT color="green">226</FONT>    <a name="line.226"></a>
<FONT color="green">227</FONT>          if (dir.exists()) {<a name="line.227"></a>
<FONT color="green">228</FONT>            File[] files = dir.listFiles(new UriCacheDescriptionFilter());<a name="line.228"></a>
<FONT color="green">229</FONT>            for (File f : files) {<a name="line.229"></a>
<FONT color="green">230</FONT>              response.add(new UriCacheDescription(f));<a name="line.230"></a>
<FONT color="green">231</FONT>            }<a name="line.231"></a>
<FONT color="green">232</FONT>          }<a name="line.232"></a>
<FONT color="green">233</FONT>          else {<a name="line.233"></a>
<FONT color="green">234</FONT>            throw new UriCacheException("Unable to find cache home at " + cacheHome);<a name="line.234"></a>
<FONT color="green">235</FONT>          }<a name="line.235"></a>
<FONT color="green">236</FONT>    <a name="line.236"></a>
<FONT color="green">237</FONT>        }<a name="line.237"></a>
<FONT color="green">238</FONT>        catch (IOException e) {<a name="line.238"></a>
<FONT color="green">239</FONT>          e.printStackTrace();<a name="line.239"></a>
<FONT color="green">240</FONT>        }<a name="line.240"></a>
<FONT color="green">241</FONT>        if (response.isEmpty()) {<a name="line.241"></a>
<FONT color="green">242</FONT>          return null;<a name="line.242"></a>
<FONT color="green">243</FONT>        }<a name="line.243"></a>
<FONT color="green">244</FONT>        else {<a name="line.244"></a>
<FONT color="green">245</FONT>          return response;<a name="line.245"></a>
<FONT color="green">246</FONT>        }<a name="line.246"></a>
<FONT color="green">247</FONT>      }<a name="line.247"></a>
<FONT color="green">248</FONT>    <a name="line.248"></a>
<FONT color="green">249</FONT>    }<a name="line.249"></a>




























































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